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WO2018108831A1 - Appareil pour sécher un produit ligneux en vrac - Google Patents

Appareil pour sécher un produit ligneux en vrac Download PDF

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Publication number
WO2018108831A1
WO2018108831A1 PCT/EP2017/082266 EP2017082266W WO2018108831A1 WO 2018108831 A1 WO2018108831 A1 WO 2018108831A1 EP 2017082266 W EP2017082266 W EP 2017082266W WO 2018108831 A1 WO2018108831 A1 WO 2018108831A1
Authority
WO
WIPO (PCT)
Prior art keywords
stream
opening
dryer
wood material
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/082266
Other languages
English (en)
Inventor
Paolo Benedetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imal SRL
Original Assignee
Imal SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imal SRL filed Critical Imal SRL
Priority to CN201780076022.8A priority Critical patent/CN110073159B/zh
Priority to EP17816698.9A priority patent/EP3555540B1/fr
Priority to US16/469,175 priority patent/US20200025444A1/en
Priority to ES17816698T priority patent/ES2901533T3/es
Publication of WO2018108831A1 publication Critical patent/WO2018108831A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/30—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotary or oscillating containers; with movement performed by rotary floors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to an apparatus for drying loose wood material.
  • Rotating drum dryers or belt dryers are generally used to perform this step of operation.
  • Drum dryers of the known type essentially have a cylindrical chamber which is extended horizontally and is kept in rotation about its own longitudinal axis and is crossed by a stream of hot air and by the material to be dried.
  • a separation system is provided, generally of the cyclone type, for recovering the particles of loose wood material entrained by the outgoing air stream.
  • drum dryers of the known type are not free from drawbacks, which include the fact that in order to increase their productivity it is necessary to increase the operating temperature and/or the rotation rate of the drum.
  • the operating temperature cannot be increased beyond certain values in order to avoid the occurrence of fires and to avoid the deterioration of the dried material which, if extensively excessively "baked” or burned, is poor in organic substances (lignin) and requires the use of greater quantities of glue for the subsequent forming, increasing production costs considerably.
  • drum dryers A further drawback of drum dryers is linked to the high energy consumption that is required to heat the air in input.
  • belt dryers which are provided with a conveyor belt made of a material that is permeable to air and closed inside a box-like enclosure.
  • the material to be dried is transferred on top of the belt while it is struck by a stream of air heated by radiators, which is introduced from above the belt and is evacuated from below by means of fans.
  • the aim of the present invention is to eliminate the drawbacks mentioned above of the background art, by providing an apparatus for drying loose wood material that allows to increase the effectiveness of the treatment by reducing the overall energy consumption and at the same time to not require the use of additional apparatuses for filtering the air from fine dust, such as an electric filter, before introduction in the environment.
  • an object of the invention is to allow operating temperatures such as to avoid the risk of setting fire to the material and such as to not degrade the processed material.
  • Another object of the present invention is to allow an increase in production without increasing the operating temperatures.
  • a still further object of the invention is to provide an apparatus for drying loose wood material that is highly reliable, relatively easy to provide and at competitive costs.
  • a rotating drum dryer provided with an inlet and an outlet for loose wood material and with an intake port and a discharge port for a first stream of heated air
  • a belt dryer provided with an entry opening and an exit opening for loose wood material and with at least one intake opening and at least one discharge opening for a second stream of heated air
  • conveyor means for transferring the loose wood material, which are interposed between said drum dryer and said belt dryer, characterized in that it comprises means for conveying the first stream in output from said discharge port toward said at least one intake opening and in that said belt dryer comprises a conveyor belt which is permeable to air, is interposed between said at least one intake opening and said at least one discharge opening, and is adapted to filter said second stream.
  • Figure 1 is a partially sectional view of a first embodiment of the apparatus for drying loose wood material according to the invention
  • Figure 2 is a partially sectional view of a second embodiment of the apparatus according to the invention.
  • the numeral 1 generally designates an apparatus for drying loose wood material, of the type of flakes or shavings of wood generally used to obtain panels or articles in general by forming.
  • the apparatus 1 comprises a rotating drum dryer 2 which is provided with an inlet 3 and with an outlet 4 for loose wood material M and with an intake port 5 and a discharge port 6 of a first stream Fi of air.
  • the drum dryer 2 which is not described in detail since it is of a type that is known to the person skilled in the art, typically provides a cylinder 7 which is extended horizontally and rotates about its own longitudinal axis and inside which a drying chamber is formed which is crossed in a longitudinal direction by the material M and by the first stream Fi.
  • the cylinder 7 has, at a first end, the intake port 5, which is associated with a hot air generator 8 for the introduction of the first stream F i in the cylinder 7 through said intake port, and has, at a second end, which is arranged opposite the first one, the discharge port 6.
  • the inlet 3 is formed above the cylinder 7 at the first end and the outlet 4 is formed below said cylinder at the second end.
  • the apparatus 1 comprises a belt dryer 9 provided with an entry opening 10 and with an exit opening 11 for the material M and with at least one intake opening 12 and at least one discharge opening 13 for a second stream F 2 of air.
  • the belt dryer 9 which is not described in detail since it is of a type that is known to the person skilled in the art, conventionally provides for a conveyor belt 14 made of a material that is permeable to air, on which the material M is made to advance from the entry opening 10 to the exit opening 11 and which is accommodated within a substantially boxlike enclosure 15.
  • the intake openings 12 and the discharge openings 13 are arranged on opposite sides of the conveyor belt so that the second stream of air F 2 passes through the belt itself, which acts as a filter and retains the solid particles entrained by the stream itself.
  • the boxlike enclosure 15 is provided in an upward region and in a downward revision with a plurality of ports which are distributed along the extension of the conveyor belt 14 and form respectively the intake openings 12 (three in the figures) and the discharge openings 13 (two in the figures) of the second stream F 2 .
  • Each intake opening 12, arranged above the conveyor belt 14, is associated with a respective radiator 16 for heating the air in input.
  • the various radiators 16 are fed with hot water that arrives from an adjacent boiler 17.
  • Each discharge opening 13, arranged below the conveyor belt 14, is associated with a respective extraction fan 18.
  • the air in output from the discharge openings 13 can be introduced directly into the environment since it is already filtered by the conveyor belt 14, which typically has a degree of filtration on the order of 10-20 mg/Nm 3 of air, without requiring the installation of separate filtration apparatuses.
  • the entry opening 10 and the exit opening 11 are formed in the enclosure 15, respectively above the loading side and below the unloading side of the conveyor belt 14.
  • apparatus 1 provides for conveyor means 19 for transferring the material M which are interposed between the dryers 2 and 9 and means 20 for conveying the first stream Fi in output from the discharge port 6 to the intake openings 12.
  • the conveyor means 19 can be constituted by conventional continuous conveyance systems, such as chain conveyors (Redler conveyors), screw feeders or the like.
  • the exhaust gases in output from the boiler 17 also can be conveyed into the conveyance means 20 by means of a supply duct 21.
  • the conveyance means 20 consist essentially of a system of ducts which are adapted to connect the discharge port 6 to the intake openings 12.
  • These conveyance means 20 in any case have at least one entry port
  • the flow rate of the second stream F 2 in input to the belt dryer 9 is in fact greater than the flow rate of the first stream F i in output from the drum dryer 2, so that it is necessary to add an amount of air that arrives from the outside environment.
  • the apparatus 1 can provide for separation means 23, for example of the cyclone type, which are interposed between the discharge port 6 and the conveyance means 20 for the recovery of the coarser particles of material M conveyed by the first stream Fi in output from the cylinder 7.
  • the substantial advantage achieved by means of the apparatus 1 is instead to avoid the installation of dedicated apparatuses for fine filtration (electric filter) of the air stream in output from the drum dryer 2 prior to introduction in the environment.
  • the conveyor means 19 are interposed between the exit opening 11 and the inlet 3 for the transfer of the material M from the belt dryer 9 to the drum dryer 2.
  • the belt dryer 9 provides a first step of drying the material M, which is then ended at a higher temperature in the drum dryer 2.
  • the second stream F 2 can be introduced in the belt dryer 9 at a temperature on the order of 100-120°C so as to provide a partial drying, reducing the degree of humidity of the material M from 100% to 45- 70%.
  • the first stream Fi instead can be introduced in the drum dryer 2 at a temperature on the order of 150-250°C so as to complete the drying of the material M up to a degree of humidity of approximately 2%, which is ideal for the subsequent processing steps to which the material M must be subjected.
  • the first stream Fi in output from the discharge port 6 maintains a temperature on the order of 80- 130°C which allows a considerable energy saving for the heating of the second stream F 2 in input to the belt dryer 9.
  • the conveyor means 19 are interposed between the outlet 4 and the entry opening 10 for the transfer of the material M from the drum dryer 2 to the belt dryer 9.
  • the drum dryer 2 provides a first step of drying of the material M, which is then ended at a lower temperature in the belt dryer 9.
  • the first stream Fi can be introduced in the drum dryer 2 at a temperature on the order of 150-350°C so as to provide a partial drying, reducing the degree of humidity of the material M from 100% to 10-40%.
  • the second stream F 2 instead can be introduced in the belt dryer 9 at a temperature on the order of 100-120°C so as to complete the drying of the material M to a degree of humidity of approximately 2%, which is ideal for the subsequent processing steps to which the material M must be subjected.
  • the first stream Fi in output from the discharge port 6 maintains a temperature on the order of 80- 130°C, which allows considerable energy- saving for the heating of the second stream F 2 in input to the belt dryer 9.
  • the described invention achieves the proposed aim and objects and in particular the fact is stressed that the apparatus according to the invention allows to perform an effective drying of the loose wood material, with an overall energy saving and without requiring the use of electric filters.
  • the apparatus according to the invention allows to maintain the operating temperature, in particular of the drum dryer, below values above which there would be the risk of setting fire to the material or deteriorating it.
  • the apparatus according to the invention allows to increase productivity without increasing the operating temperature or the rotation rate of the drum dryer, since part of the residual humidity of the material is removed during treatment in the belt dryer.
  • the apparatus according to the invention allows to obtain dried material of optimum quality and with a good content of organic substances (lignin), so as to not require the use of excessive quantities of glue for subsequent forming.
  • the apparatus according to the invention can be provided in existing installations.
  • the electric filter can be replaced with a belt dryer associated with the conveyor means and with the conveyance means described above.
  • the efficiency of the apparatus can be increased, without extending the belt excessively, by associating a drum dryer with corresponding conveyor and conveyance means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne un appareil (1) pour sécher un produit ligneux en vrac, comprenant : un séchoir à tambour rotatif (2) pourvu d'une entrée (3) et d'une sortie (4) pour produit ligneux en vrac (M), et d'un orifice d'admission (5) et d'un orifice de décharge (6) destinés à un premier flux (F1) d'air chauffé ; un séchoir à bande (9) pourvu d'une ouverture d'entrée (10) et d'une ouverture de sortie (11) destinées au produit ligneux en vrac (M), et d'au moins une ouverture d'admission (12) et d'au moins une ouverture de décharge (13) destinées à un second flux (F2) d'air chauffé ; un moyen transporteur (19) pour transférer le produit ligneux en vrac (M), qui est placé entre le séchoir à tambour (2) et le séchoir à bande (9) ; et un moyen (20) pour transporter le premier flux (F1) sortant de l'orifice de décharge (6) vers la ou les ouverture(s) d'admission (12) ; le séchoir à bande (9) comprend une bande transporteuse (14) perméable à l'air, qui est placée entre la ou les ouverture(s) d'admission (12) et la ou les ouverture(s) de décharge (13) et est conçue pour filtrer le second flux (F2).
PCT/EP2017/082266 2016-12-13 2017-12-11 Appareil pour sécher un produit ligneux en vrac Ceased WO2018108831A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201780076022.8A CN110073159B (zh) 2016-12-13 2017-12-11 用于干燥松散木质材料的设备
EP17816698.9A EP3555540B1 (fr) 2016-12-13 2017-12-11 Appareil pour le séchage de bois en vrac
US16/469,175 US20200025444A1 (en) 2016-12-13 2017-12-11 Apparatus for drying loose wood material
ES17816698T ES2901533T3 (es) 2016-12-13 2017-12-11 Aparato para secar material de madera suelto

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000125377A IT201600125377A1 (it) 2016-12-13 2016-12-13 Impianto per l'essiccazione di materiale legnoso incoerente
IT102016000125377 2016-12-13

Publications (1)

Publication Number Publication Date
WO2018108831A1 true WO2018108831A1 (fr) 2018-06-21

Family

ID=58638931

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/082266 Ceased WO2018108831A1 (fr) 2016-12-13 2017-12-11 Appareil pour sécher un produit ligneux en vrac

Country Status (6)

Country Link
US (1) US20200025444A1 (fr)
EP (1) EP3555540B1 (fr)
CN (1) CN110073159B (fr)
ES (1) ES2901533T3 (fr)
IT (1) IT201600125377A1 (fr)
WO (1) WO2018108831A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111735291A (zh) * 2020-06-01 2020-10-02 安庆市凯瑞建材有限公司 一种高效的防火保温板生产用原料烘干装置
IT202200015528A1 (it) * 2022-07-22 2024-01-22 Imal Srl Impianto per la lavorazione del legno

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR353127A (fr) * 1905-04-07 1905-09-04 Cooperative Agricole Des Secheries Du Puy-De-Dome Procédé et appareil pour sécher les cossettes de betteraves et autres produits analogues
DE505772C (de) * 1930-08-27 Hermann Haas Trockenvorrichtung fuer gemischt fein- und grobstueckiges Gut
US1927313A (en) * 1931-07-13 1933-09-19 Int Patents Dev Co Apparatus for drying starch
US2350209A (en) * 1940-09-12 1944-05-30 Kelco Co Method for drying kelp
US4177575A (en) * 1977-09-19 1979-12-11 Cannon Limited Organic material treatment process
WO2007013819A1 (fr) * 2005-07-25 2007-02-01 Flo-Dry Engineering Limited Ameliorations apportees a un procede de deshydratation de matieres pateuses et/ou a un appareil destine a la deshydratation de matieres pateuses

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DE4022702C1 (fr) * 1990-07-17 1991-11-28 Fritz Egger Ges.M.B.H., Sankt Johann In Tirol, At
AT503896B1 (de) * 2006-06-21 2008-10-15 Andritz Tech & Asset Man Gmbh Verfahren und anlage zur verarbeitung von feuchtgut
DE102008046299B4 (de) * 2008-09-09 2011-01-27 Hans Werner Verfahren und Vorrichtung zum Trocknen von Biomasse
CN202403497U (zh) * 2011-12-16 2012-08-29 湖州南浔振建机电成套设备有限公司 新型木屑烘干机
BR112015022492B1 (pt) * 2013-03-15 2021-09-21 E. & J. Gallo Winery Aparelho para secagem usando fluxo de ar condicionado ajustável e método de secagem
CN103148689B (zh) * 2013-03-27 2014-10-15 上海化工研究院 一种制备分散法ptfe树脂的带式干燥装置
WO2015104990A1 (fr) * 2014-01-10 2015-07-16 月島機械株式会社 Equipement pour la séparation solide-liquide et séchage d'une bouillie de poudre fine et procédé associé
EP3023722A1 (fr) * 2014-11-24 2016-05-25 DF Mompresa, S.A.U. Installation transportable pour le séchage de copeaux de bois
CN105865172A (zh) * 2015-12-08 2016-08-17 徐浩军 一种热风烘干机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE505772C (de) * 1930-08-27 Hermann Haas Trockenvorrichtung fuer gemischt fein- und grobstueckiges Gut
FR353127A (fr) * 1905-04-07 1905-09-04 Cooperative Agricole Des Secheries Du Puy-De-Dome Procédé et appareil pour sécher les cossettes de betteraves et autres produits analogues
US1927313A (en) * 1931-07-13 1933-09-19 Int Patents Dev Co Apparatus for drying starch
US2350209A (en) * 1940-09-12 1944-05-30 Kelco Co Method for drying kelp
US4177575A (en) * 1977-09-19 1979-12-11 Cannon Limited Organic material treatment process
WO2007013819A1 (fr) * 2005-07-25 2007-02-01 Flo-Dry Engineering Limited Ameliorations apportees a un procede de deshydratation de matieres pateuses et/ou a un appareil destine a la deshydratation de matieres pateuses

Also Published As

Publication number Publication date
EP3555540B1 (fr) 2021-09-15
US20200025444A1 (en) 2020-01-23
CN110073159A (zh) 2019-07-30
ES2901533T3 (es) 2022-03-22
IT201600125377A1 (it) 2018-06-13
EP3555540A1 (fr) 2019-10-23
CN110073159B (zh) 2021-11-26

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